App note: LED back light driving methods

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Using pulse width modulation scheme for LCD back lighting an app note from Hantronix. Link here (PDF)

LED back lights on LCD modules are generally driven with a dc voltage through a current limiting resistor. This simple approach is perfectly acceptable for most applications. When the primary consideration is an extra bright display, the lowest possible power consumption, or a back light that can be controlled over a very wide brightness range another method is needed. The purpose of the paper is to describe this method.

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